[COMMITTED] Range-on-edge trace tweak.

[Andrew MacLeod]

When working with the trace output, I noticed the columns were getting 
out of sync.

When range_on_edge is called with a constant value, it use to not output 
a trace for that. When I added the unexecutable edge code, It possible 
to request a constant on an unexecutable edge  that now returns 
UNDEFINED.  The trace output prints the header, but returns for a 
constant before outputting the trailer and realigning the columns.

Bootstrapped on x86_64-pc-linux-gnu with no regressions.  Pushed as obvious.

Andrew
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